Hertz - Upgrade question

I apologize in advance if this is a dumb question - the Hertz rules are kind of tough to navigate.

If I reserve, and pay for, a full size four door for a week, can I use 500 Hertz points for a double upgrade to the Prestige Collection?

Has anyone done this before? It looks like a great deal, only 500 points, plus cost of full size, to get a Jag for a week.

Thanks in advance for your help.

Look at your coupon. The ones I get have always (by memory) specified the maximum upgrade, either FS or Premium.

Thanks sbrower - don't actually have coupon in hand, was just trying to plan ahead.

Turns out my company's insurance turns into a pumpkin if I rent a prestige vehicle, so the idea is moot anyway. Bummer.